Roll sky by camera

constants.h

@@ -12,6 +12,9 @@
 #define LCR_FREE_CAMERA_STEP \
   (LCR_SETTING_FREE_CAMERA_SPEED / LCR_SETTING_FPS)
 
+#define LCR_FREE_CAMERA_TURN_STEP \
+  (LCR_SETTING_FREE_CAMERA_TURN_SPEED / LCR_SETTING_FPS)
+
 /** Maximum number of triangles of a block shape. */
 #define LCR_MAP_BLOCK_SHAPE_MAX_TRIANGLES 32
 

game.h

@@ -132,9 +132,18 @@ uint8_t LCR_gameStep(uint32_t time)
 
   if (time >= LCR_nextRenderFrameTime)
   {
-    LCR_drawBackground(0);
-    LCR_drawSkyStrip(0,0); // TODO: do this AFTER 3D rendering
+    int skyOffsetV = LCR_EFFECTIVE_RESOLUTION_Y / 2 + 
+      ((LCR_EFFECTIVE_RESOLUTION_Y / 2) *
+      LCR_rendererGetCameraPitch()) / 
+      (LCR_SQUARE_SIDE_LEN / LCR_SETTING_SKY_ROLL_MULTIPLIER_V);
+
+    int skyOffsetH = LCR_SKY_IMAGE_SIZE - 1 -
+      (LCR_rendererGetCameraYaw() * LCR_SKY_IMAGE_SIZE) / 
+        (LCR_SQUARE_SIDE_LEN / LCR_SETTING_SKY_ROLL_MULTIPLIER_H);
+
+    LCR_drawBackground(skyOffsetV);
     LCR_rendererDraw();
+    LCR_drawSkyStrip(skyOffsetV,skyOffsetH);
 
     LCR_nextRenderFrameTime += 1000 / LCR_SETTING_FPS;
 
@@ -146,14 +155,14 @@ uint8_t LCR_gameStep(uint32_t time)
     if (_LCR_keyStates[LCR_KEY_A])
     {
       if (_LCR_keyStates[LCR_KEY_UP])
-        offsets[4] = 4;
+        offsets[4] = LCR_FREE_CAMERA_TURN_STEP;
       else if (_LCR_keyStates[LCR_KEY_DOWN])
-        offsets[4] -= 4;
+        offsets[4] -= LCR_FREE_CAMERA_TURN_STEP;
 
       if (_LCR_keyStates[LCR_KEY_RIGHT])
-        offsets[3] -= 4;
+        offsets[3] -= LCR_FREE_CAMERA_TURN_STEP;
       else if (_LCR_keyStates[LCR_KEY_LEFT])
-        offsets[3] = 4;
+        offsets[3] = LCR_FREE_CAMERA_TURN_STEP;
     }
     else
     {

renderer.h

@@ -9,6 +9,8 @@
 #define S3L_RESOLUTION_Y LCR_SETTING_RESOLUTION_Y
 #define S3L_PIXEL_FUNCTION LCR_pixelFunc3D
 
+#define S3L_Z_BUFFER 2
+
 #include "small3dlib.h"
 
 struct LCR_Renderer
@@ -35,17 +37,17 @@ uint8_t LCR_buildMapModel(void)
 {
   // TODO
 
-  LCR_vertices3D[0] = -400;
+  LCR_vertices3D[0] = -2000;
   LCR_vertices3D[1] = -100;
   LCR_vertices3D[2] = 1000;
 
   LCR_vertices3D[3] = 400;
   LCR_vertices3D[4] = -100;
-  LCR_vertices3D[5] = 1000;
+  LCR_vertices3D[5] = 2000;
 
   LCR_vertices3D[6] = 0;
   LCR_vertices3D[7] = 400;
-  LCR_vertices3D[8] = 1000;
+  LCR_vertices3D[8] = 2000;
 
   LCR_triangles3D[0] = 0;
   LCR_triangles3D[1] = 1;
@@ -90,29 +92,13 @@ void LCR_rendererMoveCamera(LCR_SpaceUnit forwRightUpOffset[3],
   
   LCR_scene3D.camera.transform.rotation.x +=
     (yawPitchOffset[1] * S3L_FRACTIONS_PER_UNIT) / LCR_SQUARE_SIDE_LEN;
-}
 
-/*
-void LCR_getCameraPos(LCR_SpaceUnit pos[3])
-{
-  pos[0] = (LCR_scene3D.camera.transform.translation.x *
-    LCR_SQUARE_SIDE_LEN) / S3L_FRACTIONS_PER_UNIT;
-  pos[1] = (LCR_scene3D.camera.transform.translation.y *
-    LCR_SQUARE_SIDE_LEN) / S3L_FRACTIONS_PER_UNIT;
-  pos[2] = (LCR_scene3D.camera.transform.translation.z *
-    LCR_SQUARE_SIDE_LEN) / S3L_FRACTIONS_PER_UNIT;
-}
+  if (LCR_scene3D.camera.transform.rotation.x > S3L_FRACTIONS_PER_UNIT / 4)
+    LCR_scene3D.camera.transform.rotation.x = S3L_FRACTIONS_PER_UNIT / 4;
 
-void LCR_setCameraPos(LCR_SpaceUnit pos[3])
-{
-  LCR_scene3D.camera.transform.translation.x =
-    (pos[0] * S3L_FRACTIONS_PER_UNIT) / LCR_SQUARE_SIDE_LEN;
-  LCR_scene3D.camera.transform.translation.y =
-    (pos[1] * S3L_FRACTIONS_PER_UNIT) / LCR_SQUARE_SIDE_LEN;
-  LCR_scene3D.camera.transform.translation.z =
-    (pos[2] * S3L_FRACTIONS_PER_UNIT) / LCR_SQUARE_SIDE_LEN;
+  if (LCR_scene3D.camera.transform.rotation.x < -1 * S3L_FRACTIONS_PER_UNIT / 4)
+    LCR_scene3D.camera.transform.rotation.x = -1 * S3L_FRACTIONS_PER_UNIT / 4;
 }
-*/
 
 void LCR_rendererDraw(void)
 {
@@ -168,8 +154,9 @@ void LCR_drawSkyStrip(int verticalOffset, uint8_t horizontalOffset)
   {
     for (int i = 0; i < LCR_EFFECTIVE_RESOLUTION_X; ++i)
     {
-      // TODO: check z-buffer
-
+      // only diraw background on empty pixels
+      if (S3L_zBufferRead(i,verticalOffset) == S3L_MAX_DEPTH)
+      {
         int offsetX = (i / LCR_SETTING_SKY_SIZE + horizontalOffset)
           % LCR_SKY_IMAGE_SIZE;
 
@@ -179,6 +166,7 @@ void LCR_drawSkyStrip(int verticalOffset, uint8_t horizontalOffset)
 
         LCR_drawPixelUnsafe(i,verticalOffset,LCR_skyImages[pixel]); 
       }
+    }
 
     verticalOffset++;
 
@@ -189,4 +177,16 @@ void LCR_drawSkyStrip(int verticalOffset, uint8_t horizontalOffset)
 #endif
 }
 
+LCR_SpaceUnit LCR_rendererGetCameraYaw(void)
+{
+  return (LCR_scene3D.camera.transform.rotation.y * LCR_SQUARE_SIDE_LEN) /
+    S3L_FRACTIONS_PER_UNIT;
+}
+
+LCR_SpaceUnit LCR_rendererGetCameraPitch(void)
+{
+  return (LCR_scene3D.camera.transform.rotation.x * LCR_SQUARE_SIDE_LEN) /
+    S3L_FRACTIONS_PER_UNIT;
+}
+
 #endif // guard

settings.h

@@ -23,6 +23,18 @@
   #define LCR_SETTING_FREE_CAMERA_SPEED 50
 #endif
 
+#ifndef LCR_SETTING_FREE_CAMERA_TURN_SPEED
+  #define LCR_SETTING_FREE_CAMERA_TURN_SPEED 1024
+#endif
+
+#ifndef LCR_SETTING_SKY_ROLL_MULTIPLIER_V
+  #define LCR_SETTING_SKY_ROLL_MULTIPLIER_V 8
+#endif
+
+#ifndef LCR_SETTING_SKY_ROLL_MULTIPLIER_H
+  #define LCR_SETTING_SKY_ROLL_MULTIPLIER_H 4
+#endif
+
 #ifndef LCR_SETTING_MAX_VERTICES
   /** Maximum number of vertices for 3D rendering. Lower number will decrease
   RAM usage but will prevent larger maps from being loaded. */